The thing that keeps an assisted knife opening the way it did when it arrived. A drop on the pivot, a drop on the detent ball and into the detent hole, and a light coat on the blade before you put a knife away for a while.

Kershaw’s own directions are exactly that: pivot, detent ball, detent hole, then a light coat on the blade for storage. They describe the oil as non-migrating and non-toxic, and note that consuming it is not recommended.

Specifications

• Volume 20 mL
• Contains Kershaw’s SMT (Sub-Micron Technology) additive, which they describe as absorbing into the pores of the metal
• Non-migrating, non-toxic
• Base oil composition — not published
• Applicator type — not published
• Country of origin — not published

Two small honesty notes. Kershaw publishes the volume in milliliters only, so we have not converted it. And this is a genuine catalogue item with no numeric model code — Kershaw’s own part number is simply KEROIL, so the blank model number in the data is correct rather than missing.